2004-P US Thomas Alva Edison Commemorative Proof Silver DollarThe United States Mint certifies that this coin is a genuine 2004 Thomas Alva Edison Commemorative Proof Silver Dollar, struck in accordance with legislation passed by Congress and signed by the President on October 31, 1998, as Public Law 105-331. This coin was produced by the Department of the Treasury, United States Mint to commemorate the 125th Anniversary of the invention of the light bulb by Thomas Alva Edison in 1879.